"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
AirPods and AirPower: Everything We Know
Apple Opening Up iPhone Developer Program
Based on reports from developers, it seems Apple has opened the program up and dropped the "beta" designation. Multiple developers have reported that they have been accepted into the $99/year developer program which allows them to install their applications directly onto their iPhone and also submit their apps for inclusion into the iTunes App Store.
The opening up of the program should motivate more developers to start serious development on the iPhone. It should also eliminate the non disclosure agreement which prevented developers from discussing their future applications.
We have added a new iPhone Developer forum to encourage developer participation and discussion. Meanwhile, Mac developers are also welcome to participate in our long standing Mac Developer forum.